Hello.
At this time vBET do not supports vBulletin 5, but we already scheduled integration.
First we want to make another release of vBET3.x and vBET 4.x witch some significant changes.
Then we will start adopting for vBulletin 5.
We are not in hurry in this one since vBulletin 5 is still in 5.0.0 version - very early stage.
So there are still big changes possible from the API side and there is no lot of users yet.
But definitively we will go for integration with vBulletin 5
I think we should start it in April.